摘要:
An exhaust gas purifying system for an automobile engine is equipped with a metal zeolite catalytic converter for deoxidizing and purifying nitrogen oxides in exhaust gas. The system controls and compulsorily changes the air-fuel ratio of the fuel mixture injected into the automobile engine based on a target air-fuel ratio only when the temperature of the exhaust gas, before entering the catalyst, is greater than a specific temperature.
摘要:
An exhaust gas purifying catalyst includes an active compound, including platinum (Pt) and iridium (Ir), as an essential active compound base and any combination of two or more metals of terbium (Tb), nickel (Ni), indium (In), tin (Sn), cobalt (Co) and cerium (Ce), excepting a combination of indium (In) and tin (Sn), as an additive active material. The base and additive active material are deposited on and carried by a silicate carrier.
摘要:
A process is provided for the production of a catalyst useful for removing nitrogen oxides out of exhaust gases from internal combustion engines operated under lean burn conditions. The catalyst is produced by supporting at least one catalytic metal, such as platinum, iridium, rhodium, other transition metals and alkaline earth metals, as the active component on a support, such as a zeolite, by either wash-coating a solution of the catalytic metal components onto the support; evaporating off solvent from a mixture of solvent, catalyst material and support, or rapidly drying droplets of support and catalyst material containing slurry with a hot gas. The supported catalyst is activated by heating to a temperature of 150 to 300.degree. C. for a period of time sufficient to desorb catalytic material components, such as water, chlorine and ammonia, out of the pores of the catalyst that adversely affect the activity and heat resistance of the catalyst.
摘要:
An engine exhaust gas purifying catalyst contains, as active substances, platinum and at least one of iridium, III-B metals and IV-B metals. In particular, the catalyst contains mainly platinum and iridium and, desirably, rhodium as an additive catalyst substance.
摘要:
An exhaust gas purifying catalyst includes a metal-containing silicate and a noble metal active species carried by the metal-containing silicate. The metal-containing silicate has a solid acid characteristic wherein the amount of acid within a region where an acidity function Ho is equal to or smaller than -3.0 ranges from 0.04 to 0.55 mmol/gr. The noble metal active species burns an hydrocarbon component of exhaust gases to decompose an NOx component also contained in the exhaust gases. The catalyst may include a binder for carrying the noble metal active species on the metal-containing silicate. The binder has a solid acid characteristic wherein the amount of acid within a region where the acidity function Ho is equal to or smaller than -3.0 ranges from 0.04 to 0.55 mmol/gr.
摘要:
The active temperature of an exhaust gas cleaning catalyst is shifted to a higher temperature side when Al.sub.2 O.sub.3 and/or CeO.sub.2 is used as a co-catalyst and/or when an oxidation number of Pt or Ir which is used as the noble active component is plus four.
摘要翻译:当使用Al 2 O 3和/或CeO 2作为助催化剂时和/或当用作贵金属活性组分的Pt或Ir的氧化数为正时,排气净化催化剂的活性温度转移到较高温度侧 四。
摘要:
An optical communication device which can be operated at high speed is provided. For example, the optical communication device includes: a pre-amplifier circuit PREAMP1 amplifying a current signal Iin from a photodiode PD, and converting an amplified signal into a voltage signal; and an operating-point controller circuit VTCTL1 controlling an operation of the PREAMP1. The PREAMP1 includes a negative feedback path formed by a feedback resistance Rf1, and includes: a level-shift circuit LS1 level-shifting in accordance with an operating-point control signal Vcon; and an amplifier circuit AMP1 connected to a subsequent stage of the LS1 and performing an amplifying operation with a high gain. The VTCTL1 includes a replica circuit configured by the same circuit and circuit parameter as those of the AMP1 and electrically connected between the input and the output, and generates the Vcon so that an output DC level of this replica circuit is matched with an input DC level of the AMP1.
摘要:
A low offset input circuit and a signal transmission system which can accommodate a high-speed interface and achieve reduction of an offset voltage are provided. An offset voltage compensating circuit block 103 having an input circuit block 108 including an input circuit 104 and an adder-subtractor circuit block 105, switches 108, 109, a detecting circuit block 106, and an adjusting and holding circuit block 107 is provided. To compensate for an offset voltage of the input circuit block 102, an offset voltage of the input circuit block 102 is detected at the detecting circuit block 106 by turning on the switches 108, 109, and the detected offset voltage is held in the adjusting and holding circuit block 107, and negative feedback of the held offset voltage to the adder-subtractor circuit block 105 is performed. Thereby, signals Vop, Von having compensated offset voltages are outputted from the input circuit block 102.
摘要:
A novel telescopic cover of the present invention has a plurality of protection covers having top plates and vertically-suspended plates vertically suspended from the top plates, and being arranged so as to cover a guiding portion of a machining tool or the like in a freely stretchable manner between every adjacent pair of the protection covers, while being linked with each other by a linking mechanism which is configured by a plurality of linking elements linked so as to be rotatable around connecting shafts, wherein the telescopic cover has a plurality of guide rails provided to the plurality of protection covers, each having a guide groove which has one and the other guiding surfaces opposed with each other, in the direction normal to the direction of stretching and shrinkage of the entire portion of the protection covers; and a plurality of rolling elements arranged in guide groove, so as to be freely rotatable around each connecting shaft which extends in the depth-wise direction of the guide groove.
摘要:
An amplifier circuit block and a compensation circuit block are provided. The amplifier circuit block includes an analog adder for subtracting an output signal of the compensation circuit block from an input signal and an amplifier circuit operating in a wide band. The compensation circuit block includes an amplifier circuit with a low offset voltage and a low noise in a low frequency region, an analog adder block for subtracting an output signal of the amplifier circuit from an output signal of the amplifier circuit and generating a differential signal thereof, and a feedback circuit block for negatively feeding back the differential signal to the analog adder. The amplifier circuit block can reduce the offset voltage and the low-band noise by the negative feedback of the differential signal, and at the same time, the operation band of the entire amplifier circuit can be decided by the characteristic of the amplifier circuit.